BALREIRA, E. C. Incompressibility and global inversion. Topological Methods in Nonlinear Analysis, [S. l.], v. 35, n. 1, p. 69–76, 2010. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2010.005. Acesso em: 30 mar. 2023.